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Definitely a dick move. The only thing this accomplishes is you saving 10 bucks and the waiter losing 10 bucks or hearing it from the Manager and probably spitting (or worse) in your free desert.

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Oh, there was something in your desert to. Waiters, at most restaurants, have to prepare deserts. Seeing as he know was was going to get fired or, at a minimum, written up, you got a bonus prize in whatever you ordered.